Java tutorial
/* * Copyright (C) 2011 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.bumptech.glide.disklrucache; import junit.framework.Assert; import org.apache.commons.io.FileUtils; import org.junit.After; import org.junit.Before; import org.junit.Rule; import org.junit.Test; import org.junit.runner.RunWith; import org.junit.runners.JUnit4; import org.junit.rules.TemporaryFolder; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.Reader; import java.io.StringWriter; import java.io.Writer; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.concurrent.TimeUnit; import static com.bumptech.glide.disklrucache.DiskLruCache.JOURNAL_FILE; import static com.bumptech.glide.disklrucache.DiskLruCache.JOURNAL_FILE_BACKUP; import static com.bumptech.glide.disklrucache.DiskLruCache.MAGIC; import static com.bumptech.glide.disklrucache.DiskLruCache.VERSION_1; import static org.fest.assertions.api.Assertions.assertThat; @RunWith(JUnit4.class) public final class DiskLruCacheTest { private final int appVersion = 100; private File cacheDir; private File journalFile; private File journalBkpFile; private DiskLruCache cache; @Rule public TemporaryFolder tempDir = new TemporaryFolder(); @Before public void setUp() throws Exception { cacheDir = tempDir.newFolder("DiskLruCacheTest"); journalFile = new File(cacheDir, JOURNAL_FILE); journalBkpFile = new File(cacheDir, JOURNAL_FILE_BACKUP); for (File file : cacheDir.listFiles()) { file.delete(); } cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); } @After public void tearDown() throws Exception { cache.close(); } @Test public void emptyCache() throws Exception { cache.close(); assertJournalEquals(); } @Test public void writeAndReadEntry() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); creator.set(0, "ABC"); creator.set(1, "DE"); assertThat(creator.getString(0)).isNull(); assertThat(creator.getString(1)).isNull(); creator.commit(); DiskLruCache.Value value = cache.get("k1"); assertThat(value.getString(0)).isEqualTo("ABC"); assertThat(value.getLength(0)).isEqualTo(3); assertThat(value.getString(1)).isEqualTo("DE"); assertThat(value.getLength(1)).isEqualTo(2); } @Test public void readAndWriteEntryAcrossCacheOpenAndClose() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); creator.set(0, "A"); creator.set(1, "B"); creator.commit(); cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); DiskLruCache.Value value = cache.get("k1"); assertThat(value.getString(0)).isEqualTo("A"); assertThat(value.getLength(0)).isEqualTo(1); assertThat(value.getString(1)).isEqualTo("B"); assertThat(value.getLength(1)).isEqualTo(1); } @Test public void readAndWriteEntryWithoutProperClose() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); creator.set(0, "A"); creator.set(1, "B"); creator.commit(); // Simulate a dirty close of 'cache' by opening the cache directory again. DiskLruCache cache2 = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); DiskLruCache.Value value = cache2.get("k1"); assertThat(value.getString(0)).isEqualTo("A"); assertThat(value.getLength(0)).isEqualTo(1); assertThat(value.getString(1)).isEqualTo("B"); assertThat(value.getLength(1)).isEqualTo(1); cache2.close(); } @Test public void journalWithEditAndPublish() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); assertJournalEquals("DIRTY k1"); // DIRTY must always be flushed. creator.set(0, "AB"); creator.set(1, "C"); creator.commit(); cache.close(); assertJournalEquals("DIRTY k1", "CLEAN k1 2 1"); } @Test public void revertedNewFileIsRemoveInJournal() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); assertJournalEquals("DIRTY k1"); // DIRTY must always be flushed. creator.set(0, "AB"); creator.set(1, "C"); creator.abort(); cache.close(); assertJournalEquals("DIRTY k1", "REMOVE k1"); } @Test public void unterminatedEditIsRevertedOnClose() throws Exception { cache.edit("k1"); cache.close(); assertJournalEquals("DIRTY k1", "REMOVE k1"); } @Test public void journalDoesNotIncludeReadOfYetUnpublishedValue() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); assertThat(cache.get("k1")).isNull(); creator.set(0, "A"); creator.set(1, "BC"); creator.commit(); cache.close(); assertJournalEquals("DIRTY k1", "CLEAN k1 1 2"); } @Test public void journalWithEditAndPublishAndRead() throws Exception { DiskLruCache.Editor k1Creator = cache.edit("k1"); k1Creator.set(0, "AB"); k1Creator.set(1, "C"); k1Creator.commit(); DiskLruCache.Editor k2Creator = cache.edit("k2"); k2Creator.set(0, "DEF"); k2Creator.set(1, "G"); k2Creator.commit(); DiskLruCache.Value k1Value = cache.get("k1"); cache.close(); assertJournalEquals("DIRTY k1", "CLEAN k1 2 1", "DIRTY k2", "CLEAN k2 3 1", "READ k1"); } @Test public void cannotOperateOnEditAfterPublish() throws Exception { DiskLruCache.Editor editor = cache.edit("k1"); editor.set(0, "A"); editor.set(1, "B"); editor.commit(); assertInoperable(editor); } @Test public void cannotOperateOnEditAfterRevert() throws Exception { DiskLruCache.Editor editor = cache.edit("k1"); editor.set(0, "A"); editor.set(1, "B"); editor.abort(); assertInoperable(editor); } @Test public void explicitRemoveAppliedToDiskImmediately() throws Exception { DiskLruCache.Editor editor = cache.edit("k1"); editor.set(0, "ABC"); editor.set(1, "B"); editor.commit(); File k1 = getCleanFile("k1", 0); assertThat(readFile(k1)).isEqualTo("ABC"); cache.remove("k1"); assertThat(k1.exists()).isFalse(); } @Test public void openWithDirtyKeyDeletesAllFilesForThatKey() throws Exception { cache.close(); File cleanFile0 = getCleanFile("k1", 0); File cleanFile1 = getCleanFile("k1", 1); File dirtyFile0 = getDirtyFile("k1", 0); File dirtyFile1 = getDirtyFile("k1", 1); writeFile(cleanFile0, "A"); writeFile(cleanFile1, "B"); writeFile(dirtyFile0, "C"); writeFile(dirtyFile1, "D"); createJournal("CLEAN k1 1 1", "DIRTY k1"); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); assertThat(cleanFile0.exists()).isFalse(); assertThat(cleanFile1.exists()).isFalse(); assertThat(dirtyFile0.exists()).isFalse(); assertThat(dirtyFile1.exists()).isFalse(); assertThat(cache.get("k1")).isNull(); } @Test public void openWithInvalidVersionClearsDirectory() throws Exception { cache.close(); generateSomeGarbageFiles(); createJournalWithHeader(MAGIC, "0", "100", "2", ""); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); assertGarbageFilesAllDeleted(); } @Test public void openWithInvalidAppVersionClearsDirectory() throws Exception { cache.close(); generateSomeGarbageFiles(); createJournalWithHeader(MAGIC, "1", "101", "2", ""); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); assertGarbageFilesAllDeleted(); } @Test public void openWithInvalidValueCountClearsDirectory() throws Exception { cache.close(); generateSomeGarbageFiles(); createJournalWithHeader(MAGIC, "1", "100", "1", ""); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); assertGarbageFilesAllDeleted(); } @Test public void openWithInvalidBlankLineClearsDirectory() throws Exception { cache.close(); generateSomeGarbageFiles(); createJournalWithHeader(MAGIC, "1", "100", "2", "x"); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); assertGarbageFilesAllDeleted(); } @Test public void openWithInvalidJournalLineClearsDirectory() throws Exception { cache.close(); generateSomeGarbageFiles(); createJournal("CLEAN k1 1 1", "BOGUS"); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); assertGarbageFilesAllDeleted(); assertThat(cache.get("k1")).isNull(); } @Test public void openWithInvalidFileSizeClearsDirectory() throws Exception { cache.close(); generateSomeGarbageFiles(); createJournal("CLEAN k1 0000x001 1"); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); assertGarbageFilesAllDeleted(); assertThat(cache.get("k1")).isNull(); } @Test public void openWithTruncatedLineDiscardsThatLine() throws Exception { cache.close(); writeFile(getCleanFile("k1", 0), "A"); writeFile(getCleanFile("k1", 1), "B"); Writer writer = new FileWriter(journalFile); writer.write(MAGIC + "\n" + VERSION_1 + "\n100\n2\n\nCLEAN k1 1 1"); // no trailing newline writer.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); assertThat(cache.get("k1")).isNull(); // The journal is not corrupt when editing after a truncated line. set("k1", "C", "D"); cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); assertValue("k1", "C", "D"); } @Test public void openWithTooManyFileSizesClearsDirectory() throws Exception { cache.close(); generateSomeGarbageFiles(); createJournal("CLEAN k1 1 1 1"); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); assertGarbageFilesAllDeleted(); assertThat(cache.get("k1")).isNull(); } @Test public void nullKeyThrows() throws Exception { try { cache.edit(null); Assert.fail(); } catch (NullPointerException expected) { } } @Test public void createNewEntryWithTooFewValuesFails() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); creator.set(1, "A"); try { creator.commit(); Assert.fail(); } catch (IllegalStateException expected) { } assertThat(getCleanFile("k1", 0).exists()).isFalse(); assertThat(getCleanFile("k1", 1).exists()).isFalse(); assertThat(getDirtyFile("k1", 0).exists()).isFalse(); assertThat(getDirtyFile("k1", 1).exists()).isFalse(); assertThat(cache.get("k1")).isNull(); DiskLruCache.Editor creator2 = cache.edit("k1"); creator2.set(0, "B"); creator2.set(1, "C"); creator2.commit(); } @Test public void revertWithTooFewValues() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); creator.set(1, "A"); creator.abort(); assertThat(getCleanFile("k1", 0).exists()).isFalse(); assertThat(getCleanFile("k1", 1).exists()).isFalse(); assertThat(getDirtyFile("k1", 0).exists()).isFalse(); assertThat(getDirtyFile("k1", 1).exists()).isFalse(); assertThat(cache.get("k1")).isNull(); } @Test public void updateExistingEntryWithTooFewValuesReusesPreviousValues() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); creator.set(0, "A"); creator.set(1, "B"); creator.commit(); DiskLruCache.Editor updater = cache.edit("k1"); updater.set(0, "C"); updater.commit(); DiskLruCache.Value value = cache.get("k1"); assertThat(value.getString(0)).isEqualTo("C"); assertThat(value.getLength(0)).isEqualTo(1); assertThat(value.getString(1)).isEqualTo("B"); assertThat(value.getLength(1)).isEqualTo(1); } @Test public void growMaxSize() throws Exception { cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, 10); set("a", "a", "aaa"); // size 4 set("b", "bb", "bbbb"); // size 6 cache.setMaxSize(20); set("c", "c", "c"); // size 12 assertThat(cache.size()).isEqualTo(12); } @Test public void shrinkMaxSizeEvicts() throws Exception { cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, 20); set("a", "a", "aaa"); // size 4 set("b", "bb", "bbbb"); // size 6 set("c", "c", "c"); // size 12 cache.setMaxSize(10); cache.executorService.shutdown(); cache.executorService.awaitTermination(500, TimeUnit.MILLISECONDS); assertThat(cache.size()).isEqualTo(8 /* 12 - 4 */); } @Test public void evictOnInsert() throws Exception { cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, 10); set("a", "a", "aaa"); // size 4 set("b", "bb", "bbbb"); // size 6 assertThat(cache.size()).isEqualTo(10); // Cause the size to grow to 12 should evict 'A'. set("c", "c", "c"); cache.flush(); assertThat(cache.size()).isEqualTo(8); assertAbsent("a"); assertValue("b", "bb", "bbbb"); assertValue("c", "c", "c"); // Causing the size to grow to 10 should evict nothing. set("d", "d", "d"); cache.flush(); assertThat(cache.size()).isEqualTo(10); assertAbsent("a"); assertValue("b", "bb", "bbbb"); assertValue("c", "c", "c"); assertValue("d", "d", "d"); // Causing the size to grow to 18 should evict 'B' and 'C'. set("e", "eeee", "eeee"); cache.flush(); assertThat(cache.size()).isEqualTo(10); assertAbsent("a"); assertAbsent("b"); assertAbsent("c"); assertValue("d", "d", "d"); assertValue("e", "eeee", "eeee"); } @Test public void evictOnUpdate() throws Exception { cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, 10); set("a", "a", "aa"); // size 3 set("b", "b", "bb"); // size 3 set("c", "c", "cc"); // size 3 assertThat(cache.size()).isEqualTo(9); // Causing the size to grow to 11 should evict 'A'. set("b", "b", "bbbb"); cache.flush(); assertThat(cache.size()).isEqualTo(8); assertAbsent("a"); assertValue("b", "b", "bbbb"); assertValue("c", "c", "cc"); } @Test public void evictionHonorsLruFromCurrentSession() throws Exception { cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, 10); set("a", "a", "a"); set("b", "b", "b"); set("c", "c", "c"); set("d", "d", "d"); set("e", "e", "e"); cache.get("b"); // 'B' is now least recently used. // Causing the size to grow to 12 should evict 'A'. set("f", "f", "f"); // Causing the size to grow to 12 should evict 'C'. set("g", "g", "g"); cache.flush(); assertThat(cache.size()).isEqualTo(10); assertAbsent("a"); assertValue("b", "b", "b"); assertAbsent("c"); assertValue("d", "d", "d"); assertValue("e", "e", "e"); assertValue("f", "f", "f"); } @Test public void evictionHonorsLruFromPreviousSession() throws Exception { set("a", "a", "a"); set("b", "b", "b"); set("c", "c", "c"); set("d", "d", "d"); set("e", "e", "e"); set("f", "f", "f"); cache.get("b"); // 'B' is now least recently used. assertThat(cache.size()).isEqualTo(12); cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, 10); set("g", "g", "g"); cache.flush(); assertThat(cache.size()).isEqualTo(10); assertAbsent("a"); assertValue("b", "b", "b"); assertAbsent("c"); assertValue("d", "d", "d"); assertValue("e", "e", "e"); assertValue("f", "f", "f"); assertValue("g", "g", "g"); } @Test public void cacheSingleEntryOfSizeGreaterThanMaxSize() throws Exception { cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, 10); set("a", "aaaaa", "aaaaaa"); // size=11 cache.flush(); assertAbsent("a"); } @Test public void cacheSingleValueOfSizeGreaterThanMaxSize() throws Exception { cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, 10); set("a", "aaaaaaaaaaa", "a"); // size=12 cache.flush(); assertAbsent("a"); } @Test public void constructorDoesNotAllowZeroCacheSize() throws Exception { try { DiskLruCache.open(cacheDir, appVersion, 2, 0); Assert.fail(); } catch (IllegalArgumentException expected) { } } @Test public void constructorDoesNotAllowZeroValuesPerEntry() throws Exception { try { DiskLruCache.open(cacheDir, appVersion, 0, 10); Assert.fail(); } catch (IllegalArgumentException expected) { } } @Test public void removeAbsentElement() throws Exception { cache.remove("a"); } @Test public void readingTheSameFileMultipleTimes() throws Exception { set("a", "a", "b"); DiskLruCache.Value value = cache.get("a"); assertThat(value.getFile(0)).isSameAs(value.getFile(0)); } @Test public void rebuildJournalOnRepeatedReads() throws Exception { set("a", "a", "a"); set("b", "b", "b"); long lastJournalLength = 0; while (true) { long journalLength = journalFile.length(); assertValue("a", "a", "a"); assertValue("b", "b", "b"); if (journalLength < lastJournalLength) { System.out.printf("Journal compacted from %s bytes to %s bytes\n", lastJournalLength, journalLength); break; // Test passed! } lastJournalLength = journalLength; } } @Test public void rebuildJournalOnRepeatedEdits() throws Exception { long lastJournalLength = 0; while (true) { long journalLength = journalFile.length(); set("a", "a", "a"); set("b", "b", "b"); if (journalLength < lastJournalLength) { System.out.printf("Journal compacted from %s bytes to %s bytes\n", lastJournalLength, journalLength); break; } lastJournalLength = journalLength; } // Sanity check that a rebuilt journal behaves normally. assertValue("a", "a", "a"); assertValue("b", "b", "b"); } /** @see <a href="https://github.com/JakeWharton/DiskLruCache/issues/28">Issue #28</a> */ @Test public void rebuildJournalOnRepeatedReadsWithOpenAndClose() throws Exception { set("a", "a", "a"); set("b", "b", "b"); long lastJournalLength = 0; while (true) { long journalLength = journalFile.length(); assertValue("a", "a", "a"); assertValue("b", "b", "b"); cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); if (journalLength < lastJournalLength) { System.out.printf("Journal compacted from %s bytes to %s bytes\n", lastJournalLength, journalLength); break; // Test passed! } lastJournalLength = journalLength; } } /** @see <a href="https://github.com/JakeWharton/DiskLruCache/issues/28">Issue #28</a> */ @Test public void rebuildJournalOnRepeatedEditsWithOpenAndClose() throws Exception { long lastJournalLength = 0; while (true) { long journalLength = journalFile.length(); set("a", "a", "a"); set("b", "b", "b"); cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); if (journalLength < lastJournalLength) { System.out.printf("Journal compacted from %s bytes to %s bytes\n", lastJournalLength, journalLength); break; } lastJournalLength = journalLength; } } @Test public void restoreBackupFile() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); creator.set(0, "ABC"); creator.set(1, "DE"); creator.commit(); cache.close(); assertThat(journalFile.renameTo(journalBkpFile)).isTrue(); assertThat(journalFile.exists()).isFalse(); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); DiskLruCache.Value value = cache.get("k1"); assertThat(value.getString(0)).isEqualTo("ABC"); assertThat(value.getLength(0)).isEqualTo(3); assertThat(value.getString(1)).isEqualTo("DE"); assertThat(value.getLength(1)).isEqualTo(2); assertThat(journalBkpFile.exists()).isFalse(); assertThat(journalFile.exists()).isTrue(); } @Test public void journalFileIsPreferredOverBackupFile() throws Exception { DiskLruCache.Editor creator = cache.edit("k1"); creator.set(0, "ABC"); creator.set(1, "DE"); creator.commit(); cache.flush(); FileUtils.copyFile(journalFile, journalBkpFile); creator = cache.edit("k2"); creator.set(0, "F"); creator.set(1, "GH"); creator.commit(); cache.close(); assertThat(journalFile.exists()).isTrue(); assertThat(journalBkpFile.exists()).isTrue(); cache = DiskLruCache.open(cacheDir, appVersion, 2, Integer.MAX_VALUE); DiskLruCache.Value valueA = cache.get("k1"); assertThat(valueA.getString(0)).isEqualTo("ABC"); assertThat(valueA.getLength(0)).isEqualTo(3); assertThat(valueA.getString(1)).isEqualTo("DE"); assertThat(valueA.getLength(1)).isEqualTo(2); DiskLruCache.Value valueB = cache.get("k2"); assertThat(valueB.getString(0)).isEqualTo("F"); assertThat(valueB.getLength(0)).isEqualTo(1); assertThat(valueB.getString(1)).isEqualTo("GH"); assertThat(valueB.getLength(1)).isEqualTo(2); assertThat(journalBkpFile.exists()).isFalse(); assertThat(journalFile.exists()).isTrue(); } @Test public void openCreatesDirectoryIfNecessary() throws Exception { cache.close(); File dir = tempDir.newFolder("testOpenCreatesDirectoryIfNecessary"); cache = DiskLruCache.open(dir, appVersion, 2, Integer.MAX_VALUE); set("a", "a", "a"); assertThat(new File(dir, "a.0").exists()).isTrue(); assertThat(new File(dir, "a.1").exists()).isTrue(); assertThat(new File(dir, "journal").exists()).isTrue(); } @Test public void fileDeletedExternally() throws Exception { set("a", "a", "a"); getCleanFile("a", 1).delete(); assertThat(cache.get("a")).isNull(); } @Test public void editSameVersion() throws Exception { set("a", "a", "a"); DiskLruCache.Value value = cache.get("a"); DiskLruCache.Editor editor = value.edit(); editor.set(1, "a2"); editor.commit(); assertValue("a", "a", "a2"); } @Test public void editSnapshotAfterChangeAborted() throws Exception { set("a", "a", "a"); DiskLruCache.Value value = cache.get("a"); DiskLruCache.Editor toAbort = value.edit(); toAbort.set(0, "b"); toAbort.abort(); DiskLruCache.Editor editor = value.edit(); editor.set(1, "a2"); editor.commit(); assertValue("a", "a", "a2"); } @Test public void editSnapshotAfterChangeCommitted() throws Exception { set("a", "a", "a"); DiskLruCache.Value value = cache.get("a"); DiskLruCache.Editor toAbort = value.edit(); toAbort.set(0, "b"); toAbort.commit(); assertThat(value.edit()).isNull(); } @Test public void editSinceEvicted() throws Exception { cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, 10); set("a", "aa", "aaa"); // size 5 DiskLruCache.Value value = cache.get("a"); set("b", "bb", "bbb"); // size 5 set("c", "cc", "ccc"); // size 5; will evict 'A' cache.flush(); assertThat(value.edit()).isNull(); } @Test public void editSinceEvictedAndRecreated() throws Exception { cache.close(); cache = DiskLruCache.open(cacheDir, appVersion, 2, 10); set("a", "aa", "aaa"); // size 5 DiskLruCache.Value value = cache.get("a"); set("b", "bb", "bbb"); // size 5 set("c", "cc", "ccc"); // size 5; will evict 'A' set("a", "a", "aaaa"); // size 5; will evict 'B' cache.flush(); assertThat(value.edit()).isNull(); } /** @see <a href="https://github.com/JakeWharton/DiskLruCache/issues/2">Issue #2</a> */ @Test public void aggressiveClearingHandlesWrite() throws Exception { FileUtils.deleteDirectory(cacheDir); set("a", "a", "a"); assertValue("a", "a", "a"); } /** @see <a href="https://github.com/JakeWharton/DiskLruCache/issues/2">Issue #2</a> */ @Test public void aggressiveClearingHandlesEdit() throws Exception { set("a", "a", "a"); DiskLruCache.Editor a = cache.get("a").edit(); FileUtils.deleteDirectory(cacheDir); a.set(1, "a2"); a.commit(); } @Test public void removeHandlesMissingFile() throws Exception { set("a", "a", "a"); getCleanFile("a", 0).delete(); cache.remove("a"); } /** @see <a href="https://github.com/JakeWharton/DiskLruCache/issues/2">Issue #2</a> */ @Test public void aggressiveClearingHandlesPartialEdit() throws Exception { set("a", "a", "a"); set("b", "b", "b"); DiskLruCache.Editor a = cache.get("a").edit(); a.set(0, "a1"); FileUtils.deleteDirectory(cacheDir); a.set(1, "a2"); a.commit(); assertThat(cache.get("a")).isNull(); } /** @see <a href="https://github.com/JakeWharton/DiskLruCache/issues/2">Issue #2</a> */ @Test public void aggressiveClearingHandlesRead() throws Exception { FileUtils.deleteDirectory(cacheDir); assertThat(cache.get("a")).isNull(); } private void assertJournalEquals(String... expectedBodyLines) throws Exception { List<String> expectedLines = new ArrayList<String>(); expectedLines.add(MAGIC); expectedLines.add(VERSION_1); expectedLines.add("100"); expectedLines.add("2"); expectedLines.add(""); expectedLines.addAll(Arrays.asList(expectedBodyLines)); assertThat(readJournalLines()).isEqualTo(expectedLines); } private void createJournal(String... bodyLines) throws Exception { createJournalWithHeader(MAGIC, VERSION_1, "100", "2", "", bodyLines); } private void createJournalWithHeader(String magic, String version, String appVersion, String valueCount, String blank, String... bodyLines) throws Exception { Writer writer = new FileWriter(journalFile); writer.write(magic + "\n"); writer.write(version + "\n"); writer.write(appVersion + "\n"); writer.write(valueCount + "\n"); writer.write(blank + "\n"); for (String line : bodyLines) { writer.write(line); writer.write('\n'); } writer.close(); } private List<String> readJournalLines() throws Exception { List<String> result = new ArrayList<String>(); BufferedReader reader = new BufferedReader(new FileReader(journalFile)); String line; while ((line = reader.readLine()) != null) { result.add(line); } reader.close(); return result; } private File getCleanFile(String key, int index) { return new File(cacheDir, key + "." + index); } private File getDirtyFile(String key, int index) { return new File(cacheDir, key + "." + index + ".tmp"); } private static String readFile(File file) throws Exception { Reader reader = new FileReader(file); StringWriter writer = new StringWriter(); char[] buffer = new char[1024]; int count; while ((count = reader.read(buffer)) != -1) { writer.write(buffer, 0, count); } reader.close(); return writer.toString(); } public static void writeFile(File file, String content) throws Exception { FileWriter writer = new FileWriter(file); writer.write(content); writer.close(); } private static void assertInoperable(DiskLruCache.Editor editor) throws Exception { try { editor.getString(0); Assert.fail(); } catch (IllegalStateException expected) { } try { editor.set(0, "A"); Assert.fail(); } catch (IllegalStateException expected) { } try { editor.getFile(0); Assert.fail(); } catch (IllegalStateException expected) { } try { editor.commit(); Assert.fail(); } catch (IllegalStateException expected) { } try { editor.abort(); Assert.fail(); } catch (IllegalStateException expected) { } } private void generateSomeGarbageFiles() throws Exception { File dir1 = new File(cacheDir, "dir1"); File dir2 = new File(dir1, "dir2"); writeFile(getCleanFile("g1", 0), "A"); writeFile(getCleanFile("g1", 1), "B"); writeFile(getCleanFile("g2", 0), "C"); writeFile(getCleanFile("g2", 1), "D"); writeFile(getCleanFile("g2", 1), "D"); writeFile(new File(cacheDir, "otherFile0"), "E"); dir1.mkdir(); dir2.mkdir(); writeFile(new File(dir2, "otherFile1"), "F"); } private void assertGarbageFilesAllDeleted() throws Exception { assertThat(getCleanFile("g1", 0)).doesNotExist(); assertThat(getCleanFile("g1", 1)).doesNotExist(); assertThat(getCleanFile("g2", 0)).doesNotExist(); assertThat(getCleanFile("g2", 1)).doesNotExist(); assertThat(new File(cacheDir, "otherFile0")).doesNotExist(); assertThat(new File(cacheDir, "dir1")).doesNotExist(); } private void set(String key, String value0, String value1) throws Exception { DiskLruCache.Editor editor = cache.edit(key); editor.set(0, value0); editor.set(1, value1); editor.commit(); } private void assertAbsent(String key) throws Exception { DiskLruCache.Value value = cache.get(key); if (value != null) { Assert.fail(); } assertThat(getCleanFile(key, 0)).doesNotExist(); assertThat(getCleanFile(key, 1)).doesNotExist(); assertThat(getDirtyFile(key, 0)).doesNotExist(); assertThat(getDirtyFile(key, 1)).doesNotExist(); } private void assertValue(String key, String value0, String value1) throws Exception { DiskLruCache.Value value = cache.get(key); assertThat(value.getString(0)).isEqualTo(value0); assertThat(value.getLength(0)).isEqualTo(value0.length()); assertThat(value.getString(1)).isEqualTo(value1); assertThat(value.getLength(1)).isEqualTo(value1.length()); assertThat(getCleanFile(key, 0)).exists(); assertThat(getCleanFile(key, 1)).exists(); } }